An unknown host exception is returned when trying to connect to the server on HTC Rezound and only on 4g

Question

I have a very specific HTC Rezound problem for Android, and I hope someone can have a solution.

When using HTC Rezound AND connected to a 4g network, I get an unknown host error message when I try to connect to our servers using HttpURLConnection. The strange thing about this problem is that if the phone is on Wi-Fi or 3G, the connections to the server work fine. The problem is only 4g. I believe the problem is with TTL (Time to Live) servers set to 0 seconds. Unfortunately, changing TTL is not an option, and work is required.

As a test, I hardcoded the IP address of the host name and tried to connect with it, and it worked fine. Hard coding of an IP address is no longer a real solution, as the servers use a load balancer at the horizontal DNS level. I tried to programmatically restore the IP address using InitAddress:

InetAddress inet = InetAddress.getByName(url.getHost()); String ipAddress = inet.getHostAddress(); 

Fortunately, this workaround also returns an Unknown host exception.

I also tried changing the internal DNS DNS cache using:

  System.setProperty("networkaddress.cache.ttl" , "100"); 

But that didn't work either.

Any other suggestions or solutions are welcome!

Thanks.

Answer 1

I had a problem with 3g, because ISP for the proxy server is the default by default (everything else worked fine with the other isp). Try to check the connection settings on the device and delete, if any. Hope this helps.